"price calculator" (ability to compute basic math functions)

[rising_suns]

Hello! Newbie here!
I am interested in using Zen Cart. However, I need the ability to be able to compute total price based on selections that the customer makes in either a text field or check box. For example (this is just a hypothetical), if I am selling rocks at $500/lb., the customer would need to be able to enter the number of pounds of rocks he would like to purchase, and the price calculator would calculate the total automatically based on a simple formula that I input.

I was wondering if Zen Cart cart has this ability to do this, such as multiply, divide, add, and subtratct (like a price calculator). And if not, do you happen to know of a cart that can?

Many thanks for any information you can provide.

-Davide

[rising_suns]

I hope you don't mind if I bump this.